hg: jigsaw/m2/jdk: Eliminate use of RandomAccessFile + synchronization in jimage code when running

[alan.bateman at oracle.com]

Changeset: 624c2865ef80
Author:    alanb
Date:      2014-11-10 18:41 +0000
URL:       http://hg.openjdk.java.net/jigsaw/m2/jdk/rev/624c2865ef80

Eliminate use of RandomAccessFile + synchronization in jimage code when running
  on JDK 9

! make/Tools.gmk
! make/mapfiles/libjava/mapfile-vers
! src/java.base/share/classes/jdk/internal/jimage/BasicImageReader.java
+ src/java.base/share/classes/jdk/internal/jimage/PReader.java
+ src/java.base/share/classes/jdk/internal/jimage/concurrent/ConcurrentPReader.java
+ src/java.base/unix/native/libjava/ConcurrentPReader_md.c
+ src/java.base/windows/native/libjava/ConcurrentPReader_md.c